I've been trying to install this mod to my server. I've only once installed a mod ( Elemental Arrows ) which was for single player, and it worked just fine (I had modified my jar with modloader and put all the elemental arrows files into the jar also).
I did the exact same thing for my 'client side' jar file for this Ropes+ mod, and I am keeping this one in my bin folder (as minecraft.jar). Then i put the Ropes+ Zip file into the mods folder under 'minecraft'.
For the server side, I took a copy of the default jar and inside that I put the modloader and modloadermp files along with the ropes+ zip file.
I uploaded the jar to the appropriate folder, but the server would not run the jar. It says 'Corrupt jar' from my part. What could i be doing wrong?